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Proceedings Article

Amplitude variations on the ExAO testbed

[+] Author Affiliations
Julia W. Evans, Donald Phillion

Lawrence Livermore National Lab.

Sandrine Thomas, Daren Dillon, Donald Gavel

Univ. of California, Santa Cruz

Bruce Macintosh

Lawrence Livermore National Lab. and Univ. of California, Santa Cruz

Proc. SPIE 6693, Techniques and Instrumentation for Detection of Exoplanets III, 669312 (September 19, 2007); doi:10.1117/12.735741
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From Conference Volume 6693

  • Techniques and Instrumentation for Detection of Exoplanets III
  • Daniel R. Coulter
  • San Diego, CA | August 26, 2007

abstract

High-contrast adaptive optics systems, such as those needed to image extrasolar planets, are known to require excellent wavefront control and diffraction suppression. At the Laboratory for Adaptive Optics on the Extreme Adaptive Optics testbed, we have already demonstrated wavefront control of better than 1 nm rms within controllable spatial frequencies. Corresponding contrast measurements, however, are limited by amplitude variations, including those introduced by the micro-electrical-mechanical-systems (MEMS) deformable mirror. Results from experimental measurements and wave optic simulations of amplitude variations on the ExAO testbed are presented. We find systematic intensity variations of about 2% rms, and intensity variations with the MEMS to be 6%. Some errors are introduced by phase and amplitude mixing because the MEMS is not conjugate to the pupil, but independent measurements of MEMS reflectivity suggest that some error is introduced by small non-uniformities in the reflectivity.

© (2007) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Julia W. Evans ; Sandrine Thomas ; Daren Dillon ; Donald Gavel ; Donald Phillion, et al.
"Amplitude variations on the ExAO testbed", Proc. SPIE 6693, Techniques and Instrumentation for Detection of Exoplanets III, 669312 (September 19, 2007); doi:10.1117/12.735741; http://dx.doi.org/10.1117/12.735741


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